Clear cache on Chrome browser with TimeRange = All Time using C# and selenium

gistfile1.txt

public static void ClearBrowserCache(this IWebDriver webDriver)
        {

            webDriver.Navigate().GoToUrl("chrome://settings/clearBrowserData");

            // begin identify clear data button via nested Shadow Dom elements
            // get 1st parent
            IWebElement root1 = webDriver.ByCssSelector("settings-ui");
            // get 1st shadowroot element
            IWebElement shadowRoot1 = root1.getShadowRootElement();

                // get 2nd parent
             IWebElement root2 = shadowRoot1.FindElement(By.CssSelector("settings-main"));
                // get 2nd shadowroot element
                IWebElement shadowRoot2 = root2.getShadowRootElement();

                // get 3rd parent
                IWebElement root3 = shadowRoot2.FindElement(By.CssSelector("settings-basic-page"));
                // get 3rd shadowroot element
                IWebElement shadowRoot3 = root3.getShadowRootElement();

                // get 4th parent
                IWebElement root4 = shadowRoot3.FindElement(By.CssSelector("settings-section > settings-privacy-page"));
                // get 4th shadowroot element
                IWebElement shadowRoot4 = root4.getShadowRootElement();

                // get 5th parent
                IWebElement root5 = shadowRoot4.FindElement(By.CssSelector("settings-clear-browsing-data-dialog"));
                Thread.Sleep(100);
                // get 5th shadowroot element
                IWebElement shadowRoot5 = root5.getShadowRootElement();
                
                // get 6th parent
                IWebElement root6 = shadowRoot5.FindElement(By.CssSelector("#clearBrowsingDataDialog"));

                SelectTimeRangeAll(root6);
                // get button (finally!)
                IWebElement clearDataButton = root6.FindElement(By.CssSelector("#clearBrowsingDataConfirm"));
                // end identify clear data button via nested Shadow Dom elements

                clearDataButton.Click(); // click that hard to reach button!
                Thread.Sleep(2000);
            }
           
        public static void SelectTimeRangeAll(IWebElement root)
        {
            IWebElement root1 = root.FindElement(By.CssSelector("iron-pages#tabs"));
//            IWebElement shadowRoot1 = root1.getShadowRootElement();

            IWebElement root2 = root1.FindElement(By.CssSelector("settings-dropdown-menu#clearFromBasic"));
            IWebElement shadowRoot2 = root2.getShadowRootElement();

            IWebElement ddnTimeRange = shadowRoot2.FindElement(By.CssSelector("select#dropdownMenu"));

            SelectElement selectTimeRange = new SelectElement(ddnTimeRange);
            selectTimeRange.SelectByValue("4");
        }
        
        public static IWebElement getShadowRootElement(this IWebElement element)
        {
            IWebDriver driver = ((IWrapsDriver)element).WrappedDriver;
            IJavaScriptExecutor js = driver as IJavaScriptExecutor;
            IWebElement ele = (IWebElement)js.ExecuteScript("return arguments[0].shadowRoot", element);
            return ele;
        }

This is first version of code to clear cache.